Plus insert more complex formulas
Add Numbers in Columns in a Word Table: Insert Formula to Sum a Column or Row in a Table in Word?
With Word, you can calculate the sum of a column in a table, just as you would in a spreadsheet program like Excel. This post will show you how to do this in Word 2003, 2007, and 2010/2013/2016. As an example, we'll sum a column of decimal numbers.
Open Word and place the cursor in the empty cell at the bottom of the column containing the numbers you want to add.
The Table Tools tabs become available. Click the Layout tab.